Capillary pressure curves for low permeability chalk obtained by NMR imaging of core saturation profiles

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:207309

Norgaard, J V; Olsen, D; Springer, N ^[1]

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1. SPE, Richardson, TX (United States); and others

A new technique for obtaining water-oil capillary pressure curves, based on NMR imaging of the saturation distribution in flooded cores is presented. In this technique, a steady state fluid saturation profile is developed by flooding the core at a constant flow rate. At the steady state situation where the saturation distribution no longer changes, the local pressure difference between the wetting and non-wetting phases represents the capillary pressure. The saturation profile is measured using an NMR technique and for a drainage case, the pressure in the non-wetting phase is calculated numerically. The paper presents the NMR technique and the procedure for calculating the pressure distribution in the sample. Inhomogeneous samples produce irregular saturation profiles, which may be interpreted in terms of variation in permeability, porosity, and capillary pressure. Capillary pressure curves for North Sea chalk obtained by the new technique show good agreement with capillary pressure curves obtained by traditional techniques.

• OSTI ID: 207309
• Report Number(s): CONF-951002--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CAPILLARY FLOW
LIMESTONE
MAGNETIC SURVEYS
NUCLEAR MAGNETIC RESONANCE
OIL SATURATION
OIL WELLS
PERMEABILITY
PRESSURE GRADIENTS
RESERVOIR FLUIDS
RESERVOIR ROCK